the xr22 vco ft is a modified version of the previous model xr22 vco with a different manual frequency control. instead of the two &pm;2-octave switches and the two frequency knobs (ca 4-octave range), there are
now two frequency knobs (ca 7-octave range) for coarse tuning and 2 fine tuning knobs. further, the 'low f' frequency range switch - which works for both fsk frequencies - is replaced by a 3-position shift
switch with the settings 'lo' (for lfo/ tremolo applications), 'mid' (for bass sounds) and 'hi' (for normal/high frequency sounds).